When I was younger, I once changed the oil myself in my 1992 Nissan Sentra. I used the standard scissors jack it came with, jacked up the front right side, and slid underneath to do the work. Nothing bad happened, but I had no idea of the danger I had put myself in…and in this case, what you don’t know can kill you! Today’s safety topic comes from Mike Bumbeck, the author of http://www.clunkbucket.com/. This is what he has to say on the subject:
While the scissor jack in your trunk is fine for emergency wheel changes, when it comes time to working underneath your vehicle, a floor jack and two or more sturdy jack stands are the tools for the job. A heavy-duty floor jack used in conjunction with jack stands will provide safe vehicle support. Never work under a vehicle supported by a jack alone.
Jack Types
Floor jack and jack stand sets are more affordable than ever. Everything from smaller lightweight 1-ton to super duty 5-ton models can be found for a reasonable price. Determining which setup you need depends largely on the weight of your vehicle. There's no need to get a 5-ton set if you drive a compact import, and a 1-ton set won't cut it for lifting a full size SUV.
Another important factor to consider is vehicle ground clearance. Low-profile floor jacks are designed to squeeze into tight spaces. Some sportier cars and trucks have ground hugging front, rear, and side mounted aerodynamic body panels that require a low-profile floor jack for clearance. If you can't get the jack under the vehicle you're back to square one.
Procedure
The procedure is to raise the vehicle high enough to get the jack stands underneath, and then slowly lower the vehicle onto the stands. Once the vehicle is secure on the stands, the jack can be removed, allowing you to work safely underneath. The very first step is to park the vehicle on solid, level ground such as a concrete or paved surface. Place the vehicle in park, set the emergency brake, or use a wheel chock to prevent the vehicle from moving.
Jacking and jack stand support points are also extremely crucial. A jack or jack stand in the wrong location can cause vehicle or bodily damage. Your owner's manual is a good place to find safe jacking locations for your vehicle. Never jack up a vehicle from a point not designed to handle the load. If unsure about where to place a jack or jack stand, the best strategy is to stop. Do not attempt to guess at a good location. You can easily put holes in your floorboards or worse—yourself!
Lowering
When lowering the vehicle onto the stands or back onto the ground it is important to g-e-n-t-l-y release the hydraulic pressure inside the jack. Before lowering the vehicle always double check your jack stands, or make sure the area is clear by looking and loudly saying "clear!" Slow lowering of the vehicle not only prevents damage, but gives you time to see any potential hazards before they occur. Practice raising and lowering the jack to get a good feel for how it operates before attempting the real deal.
After the vehicle is up and on the jack stands always check for solid support before attempting to work underneath. The best way to do this is to grab onto the bumper and give the vehicle a quick back and forth shake. It's much better to determine if the vehicle is solidly supported while you're above it then when underneath. The wheel chock is a good idea for an extra margin of safety once you have performed this test. Take it slow the first time around and soon you will be raising and lowering your vehicle like a pro.
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